Illustration of a heraldic rampant lion on hind legs, like those found on a coat of arms
Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
Jupiterimages/Photos.com/Getty Images. The oak tree is a large growing variety that grows up to 100 feet in height with a crown spread of 80 feet. Oak trees have a large root system that is sensitive to soil characteristics, pH and water content.are. Oak trees prefer a moderately dry soil and are susceptible to root rot when there is excess water around the root ball area. Apply a 3- to 4-inch layer of bark mulch around the tree to prevent weed growth and help hold moisture in the soil during the hot summer months.